//
//  C7Calculator.h
//  精通Objective-C
//
//  Created by 花强 on 2017/11/28.
//  Copyright © 2017年 花强. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface C7Calculator : NSObject

-(NSNumber *)sumAddend1:(NSNumber *)adder1 addend2:(NSNumber *)adder2;
-(NSNumber *)sumAddend1:(NSNumber *)adder1 :(NSNumber *)adder2;//这个方法的第二个参数使用空参数

@end
